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TS3A24159: Signal Distortion

indumathi s1
Prodigy 30 points
Part Number: TS3A24159
Other Parts Discussed in Thread: TS5A23157, TXU0304, TXU0104, TXU0204

Hi Team,

1MHZ signal being driven from level shifter to de-MUX section as mentioned below. I have observed the distorted signal at de-MUX output and also voltage level is clamped and distorted to 2.4V instead of 3.3V. 

After Removing the TS3A24159 and direct shorting I could get a proper signal with 3.3V without any issues. Let me know if there are any issues with this combination of the components used in my circuit.

  • 0
    TI__Genius 10974 points

    Hello,

    This part has a pretty low bandwidth as is (only 23MHz). With the signal passing through all of those other devices, this adds additional capacitance to the line and can attenuate the signal once it reaches the multiplexer. I know you mentioned when you removed the mux, the signal looked OK. Have you tried removed other components on the signal chain and if you get the same result (say remove the level shifter and monitor the output).

    Lastly, you can use a higher bandwidth device for this application as well as you probably do not need such low resistance for this kind of application. I would suggest looking into the TS5A23157 which is probably a better fit here.

    Let me know what you think.

    Thanks!

    Bryan

  • 0 in reply to Bryan Marshall
    Prodigy 30 points

    Hi Brian,

    The issue is that the Level shifter output was clamping to 2.4V instead of swinging to 3.3V and after isolating the Demux it is resolved. do you suspect the level shifter output capacitance and demux's input capacitance are not within limits??

    This is how the signal looks when a 1MHZ 1-bit packet [ High and low] is sent.

  • +1 in reply to indumathi s1
    Guru 317370 points

    Your image shows the switch connected to an LVDS transceiver, but the voltage levels do not look like LVDS. Please show the real schematic.

    If this signal actually comes from the TXB, then it is likely that the load is too high for the TXB. In this case, replacing it with the TXU0104/TXU0204/TXU0304 would help.